On 16.01.2017 20:19, Daniel Gaspary wrote:
Can you give examples of these messages? And who (nginx, apache..?)
and how they are implemented?
In fact I can't, either, that is why I ask.
I do know that there are several frameworks that support this by running
rather complex Java script on the Client. (For Pascal there once was
EXTPascal, but AFAIK, the project has died. )
AFAIK there are several "standard" ways to use a HTTP connection via a
HTTP server in reverse direction, including polling by Java script,
holding a connection open for an extended amount of time and using an
additional TCP/IP socket. (I seem to remember names like "Comet" or
"WebSocket". "WebAssembler" might be a future extension to this, in
future potentially allowing to run projects created from Pascal code
directly in the browser.)
It would be nice to have a package Lazarus that supports such things.
-Michael
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